I agree that the breakdancer is one of your strongest pieces, but that it could still use some tweaking to make it even better. You’ve said that you’ll fix the windmills when you’ve got the time, and I think that will definitely strengthen the piece.
I’d also take another look at the moment where he first plants his right foot (the one on our left) while the other is still in the air. There seems to be an unnatural pause in the motion there before his torso starts rotating. I watched the motion frame by frame in Quicktime and saw that I was wrong: there actually is no pause. The torso is hidden behind his waist at that moment, but his left arm lifts off the ground the very frame after the foot is planted. Even so, there still seems to be a pause between the foot going down and the arm going up. I think this might be because those two motions happen in two separate steps while the the rest of his movements overlap so fluidly. I’d try bringing that left arm off the ground a frame or two before the foot touches down, giving him a moment of being completely airborne and constantly twisting. Then again, it could just be that I’m looking at things wrong.
My only other critique is about the Gladiators clip at the end, specifically where the gladiator on our right shoves the one on our left. I think that his anticipation before the shove goes too slowly and gradually; it almost looks like it’s in slow motion, but the announcer’s voiceover is playing in realtime. I’d suggest having the gladiator jerk his hands back into a ‘ready-to-shove’ position, pausing for a few frames to build anticpation, and then quickly thrusting his palms forward and into the opponent. You don’t want him to go so fast that he’s jerky, but you also don’t want him to go so slow that he’s graceful.
Overall good job though, and good luck on finishing up the short!